Help novarossi sx12 running problems

[novarossi]

https://www.rcnitrotalk.com/forum/picture.php?albumid=580&pictureid=3417

Hi all any suggestions would be fantastic here goes I've got an old g4 with a novarossi sx 12 engine it starts up stright away plenty of off the line and top end speed now after about half a tank approx 120c temp i stop then it just dies but the odd thing is it wont start again doesn't even sound to be fireing you can hear the presure poping as it should if i let it cool down five minutes its fires back up then five minutes later i stop to check temp around 120/130 then dies and over and over it does it again all running seams good thin trail of smoke on full throtle no bogging idel is all good.found fuel leaking on engine not from carb or any pipes can't see where so then started getting sick of it so out came the tools engine out heat sink off side case off piston out cleaned it all out with wd40 now very clean and shinny internaly put it all back together with gasket sealent nice and tight fires it up starts up keaner than ever no fuel to be seen leaking anywhere just need to take it for a few laps tomorrow,any suggestions if it continues to quit on me.thanks

 

[novarossi]

all is looking well reved abit high at first for 5 minutes settled down after that not a drop of fuel anywhere must of had a small leak at the seal causeing loss of preasure run for over an hour starting up everytime like new think I've just saved my old team magic g4 from the bin if anybody knows what my engine options are as a back up engine value for money please fill me in all i can think of are as follows correct me if I'm wrong.
1.IDM Novarossi 0.12 T3
2.JP Novarossi X-12
3.novarossi 353-12
4.novarossi 3sct-12
5.novarossi N12T1

 

[ohsnap]

Are you a serious racer or a club racer or a basher?
Reason I ask is that you've listed a broad spectrum of engine capabilities and costs.

To me, something like the 353 (which is a now discontinued model having been replaced by the Flash.12PT / Flash.12-5 Tuned) is a relatively serious competition engine; while the NT12 is an adequate touring/sports engine and can be found for about 200-350 US dollars cheaper than the competition options.

That 200-350 buck difference in the 353 (and Flash) buys you hand tuned crankshafts, ceramic bearings, and about 4,000 to 5,000 more top end rpms.
Unless you're a serious racer or have money to burn, I'd stick with something like the NT12 (or the current N12LL3/11 or N12LL5/11).

eBay is a good place to pick up older NIB engines (including the 353 and NT12's).
I see there's a Rex (Novarossi) RER 12s3 currently for sale.
Something like this is an awesome engine for the price it'll probably go for - and I believe a step up from the SX12 that you already have.

Since you only listed Novarossi engines, I've kept my response specific to the Novarossi brand, although I should point out that there are other brands out there that also make good engines.
BTW - I really like Novarossi engines myself, so I can't argue with your choice of brand.

 

[novarossi]

hi there thank you for the response i wouldnt say I'm new to it all but not as advanced as some just the basics of knowing a good set up ect striping rebuilds i only use my cars at my local club track (Halifax) i see what you mean with ebay I'm just after something on the grounds of the sx12 not over the top with the wallet whats the differance between the nt12 t1 tuned new from hong kong £122 and the one i might have a bid on a idm novarossi t3 tuned by someone called Daniel Ielasi apparently just broken in at the track not raced.thanks for you info

 

[ohsnap]

I'm not familiar with the tuned engine that you mentioned, so to me the difference boils down to the fact that one is new and the other used.

I don't recommend buying a used motor from anyone that you don't know.

There's also enough reasonably priced unused engines on eBay, that you can cherry pick some pretty good deals.
If I was looking for a good runner, I'd be bidding on the engine that I pointed out or some of the newer (but not this years model) engines like that NT12 that are hanging around in some sellers inventory.

Anytime I buy a used engine off of eBay, I fully expect to be rebuilding it - no matter what the seller says about it.
The pictures may give you an idea as to how much an engine has been used or abused.
On the other hand, the engine may look nice and clean in the pictures, but may have some internal issues (example - raced but not broken in properly).
You just don't know and you're rolling the dice buying a used engine.

So, buying used boils down to this.
Are you feeling lucky or will you be rolling snake-eyes?